Tag Archive for: UGS

Can anyone “Spot the Rock” this week? This photo shows one of the many textures present in Utah’s geology. Tell us where you think this is!

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UPDATE: Location Revealed
The Honeycombs, or Honeycomb Hills, is a solitary cluster of hills far out in Utah’s West Desert between the Fish Springs and Deep Creek Ranges. The hills are a product of a violent volcanic eruption some 4.7 million years ago, where forty feet of tuff underlies a 200 million cubic yard dome of topaz-rich rhyolite. The Honeycombs gets its name from the texture of the rock; a recurrent pattern of alcoves, hollows and cubbies, called tafoni, created from a weathering process known as honeycomb, cavernous, or alveolar weathering. This type of weathering is most common to seacoasts and deserts in sandstones and granites on inclined or vertical rock faces. Salt weathering has been implicated in forming tafoni, as well as many other physical, chemical, and biological mechanisms. The weathering of rock into tafoni can occur rapidly, as seen on seawalls built only centuries ago.

 

Mary Ellen Gulch, American Fork Canyon, Utah County, Utah
Photographer: Tyler Knudsen; © 2013

Quartzite of the 900 million-year-old Big Cottonwood Formation holds up the rugged headwall of Mary Ellen Gulch. Well-preserved ripple marks and mud cracks indicate the Big Cottonwood Formation was deposited in the tidal zone of a shallow sea.

Zion National Park, Washington County, Utah
Photographer: Ken Krahulec; © 2013

Towering cliffs of Jurassic-age sandstone constrict lower Zion Canyon. The prominently cross-bedded Navajo Sandstone, deposited in a vast dune field comparable to that of the modern-day Sahara, forms the cliffs, including the narrow spine of Angels Landing at left.

Happy Memorial Day!

Great Salt Lake viewed from Antelope Island, Davis County, Utah
Photographer: Chris DuRoss; © 2013

Great Salt Lake occupies a large basin formed by horizontal stretching of the Earth’s crust across the region. This stretching produces movement on faults, resulting in uplift of mountain ranges adjacent to the
basins and occasional magnitude 6.5–7.5 earthquakes.

Here’s a photo to help you get back into the swing of things. We hope everyone had a great weekend!

Wendover, Box Elder County, Utah
Photographer: Gregg Beukelman; © 2013

Jurassic-age quartz monzonite at Crater Island near Wendover, Box Elder County.

Red Canyon, San Juan County, Utah
Photographer: Don DeBlieux; © 2013

Wingate Sandstone cliffs at Red Canyon, east of Lake Powell, San Juan County.

The “Tower of Silence” along Wahweap Creek, Grand Staircase–Escalante National Monument, Kane County, Utah
Photographer: Gregg Beukelman; © 2013

Boulders of Cretaceous-age Dakota Sandstone act as protective caps and inhibit erosion of the soft Jurassic-age Entrada Sandstone beneath, allowing hoodoo spires to form. Water cascading over the Entrada Sandstone during rainstorms has carved an intricate network of rills.

Long Canyon viewed from Pucker Pass, Grand County, Utah
Photographer: Gregg Beukelman; © 2013

At Long Canyon, stream erosion has carved a deep gorge into the east limb of the Cane Creek anticline. The canyon exposes dark-brown Triassic-age shale and sandstone of the Moenkopi and Chinle Formations capped by vertical cliffs of Triassic and Jurassic-age sandstone of the Wingate and Kayenta Formations.

We hope you’ve all had a great weekend! Here’s another stunning photo of Utah geology to start the week out.

Pahvant Butte, Millard County, Utah
Photographer: Mark Gwynn; © 2012

Little Wild Horse Canyon, Emery County, Utah
Photographer: Gregg Beukelman; © 2012

Navajo Sandstone in Little Wild Horse Canyon, Emery County.